package com.hwj.controller;

import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.common.auth.CredentialsProvider;
import com.aliyun.oss.common.auth.DefaultCredentialProvider;
import com.aliyun.oss.common.utils.BinaryUtil;
import com.aliyun.oss.model.MatchMode;
import com.aliyun.oss.model.PolicyConditions;
import com.aliyuncs.exceptions.ClientException;
import com.hwj.utils.JsonResponse;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.Map;


/*
* 通过客户端直传实现
* */
@CrossOrigin(origins = "http://localhost:81", allowCredentials = "true")
@RestController
@RequestMapping("/oss")
public class AliyunOSSController {

    /*获取policy*/
    @GetMapping("/policy")
    public JsonResponse policy() throws ClientException {
        String endpoint = "oss-cn-beijing.aliyuncs.co";
        // 从环境变量中获取访问凭证。运行本代码示例之前，请确保已设置环境变量OSS_ACCESS_KEY_ID和OSS_ACCESS_KEY_SECRET。
        String accessKeyId = "LTAI5tGCwRyKi21JNv3zB1Ti";
        String secretAccessKey = "NxUTzJs2fsOagNHMO5Ky5IxmQNNxYp";
        CredentialsProvider credentialsProvider = new DefaultCredentialProvider(accessKeyId, secretAccessKey);
        // 填写Bucket名称，例如examplebucket。
        String bucket = "petshareforum";
        // 填写Host名称，格式为https://bucketname.endpoint。
        //https://petshareforum.oss-cn-beijing.aliyuncs.com/c0007bac56142dd2785fec49ac4628b.jpg
        String host = "https://petshareforum.oss-cn-beijing.aliyuncs.com";
        // 设置上传回调URL，即回调服务器地址，用于处理应用服务器与OSS之间的通信。OSS会在文件上传完成后，把文件上传信息通过此回调URL发送给应用服务器。
        //String callbackUrl = "https://192.168.0.0:8888";
        // 设置上传到OSS文件的前缀，可置空此项。置空后，文件将上传至Bucket的根目录下。
        String format = new SimpleDateFormat("yyyy-MM-dd").format(new Date());
        String dir = format+"/";

        // 创建OSSClient实例。
        OSS ossClient = new OSSClientBuilder().build(endpoint, credentialsProvider);

        Map<String, String> respMap=null;
        try {
            long expireTime = 30;
            long expireEndTime = System.currentTimeMillis() + expireTime * 1000;
            Date expiration = new Date(expireEndTime);
            // PostObject请求最大可支持的文件大小为5 GB，即CONTENT_LENGTH_RANGE为5*1024*1024*1024。
            PolicyConditions policyConds = new PolicyConditions();
            policyConds.addConditionItem(PolicyConditions.COND_CONTENT_LENGTH_RANGE, 0, 1048576000);
            policyConds.addConditionItem(MatchMode.StartWith, PolicyConditions.COND_KEY, dir);

            String postPolicy = ossClient.generatePostPolicy(expiration, policyConds);
            byte[] binaryData = postPolicy.getBytes("utf-8");
            String accessId = credentialsProvider.getCredentials().getAccessKeyId();
            String encodedPolicy = BinaryUtil.toBase64String(binaryData);
            String postSignature = ossClient.calculatePostSignature(postPolicy);

            respMap = new LinkedHashMap<String, String>();
            respMap.put("accessid", accessId);
            respMap.put("policy", encodedPolicy);
            respMap.put("signature", postSignature);
            respMap.put("dir", dir);
            respMap.put("host", host);
            respMap.put("expire", String.valueOf(expireEndTime / 1000));
            // respMap.put("expire", formatISO8601Date(expiration));


        } catch (Exception e) {
            // Assert.fail(e.getMessage());
            System.out.println(e.getMessage());
        } finally {
            ossClient.shutdown();
        }
        return JsonResponse.successResponse(0,"获取policy成功",respMap);
    }
}
